package Semester_2.src.Util_2.practice;
import java.util.*;
public class Boxing_and_unboxing {
    public static void main(String []args){
        Use_StringBuilder();
        Use_ArraysList();
    }
    public static void Use_StringBuilder(){
        StringBuilder a=new StringBuilder();
        a.append("nihao").reverse();
        System.out.println(a);
    }
    public static void Use_ArraysList(){
        ArrayList<String> c =new ArrayList<>();
        c.add(0,"nihao");
        System.out.println(c);
        c.remove(0);
    }
    public static void Use_all(){
        
    }
}
